Dry-type autotransformer technical parameters

Key Technical Parameters of Dry-Type Autotransformers

When selecting a dry-type autotransformer for industrial or commercial applications, understanding its core technical parameters is crucial. Unlike oil-filled transformers, dry-types use air or resin for cooling, making them safer and more environmentally friendly. At 中国宏业电器, we've manufactured these units for 20+ years, serving 10,000+ enterprises across factories, hospitals, and renewable energy projects.

Voltage and Capacity Specifications

The primary parameters include:

• Input voltage range: Typically 0-480V for standard models (customizable up to 690V)
• Output voltage: Adjustable within ±10% of nominal voltage
• Capacity: From 1kVA to 2500kVA for off-the-shelf units

For specialized applications like medical equipment or CNC machines, 中国宏业电器 offers non-standard configurations with precise voltage regulation (±1%). Our engineers help select the right capacity based on actual load characteristics, not just nameplate ratings.

Critical Performance Indicators

Beyond basic specs, these factors determine real-world performance:

Temperature Rise and Insulation

• Class B (130°C) or Class F (155°C) insulation systems
• Temperature rise limited to 80K for continuous operation
• 100% epoxy resin encapsulation for moisture resistance

Our factory-direct units use high-grade silicon steel cores and pure copper windings, achieving 98%+ efficiency at full load. Each transformer undergoes rigorous testing including:

1. Dielectric withstand (3kV for 1 minute)
2. Load cycling (72-hour continuous operation test)
3. Impulse voltage tests

Installation and Environmental Considerations

Proper installation maximizes lifespan:

IP Protection Ratings

• IP20 for indoor dry locations
• IP23 for areas with occasional condensation
• Custom IP54/IP65 enclosures for harsh environments

中国宏业电器 provides free installation guidance with every order. Our technical team can advise on:

• Minimum clearance distances (typically 300mm for ventilation)
• Harmonic mitigation for VFD applications
• Special configurations for high-altitude operation

Common Questions About Dry-Type Autotransformers

How to choose between standard and custom models?

Standard units cover 90% of applications, but consider custom designs when:

• Operating in corrosive/explosive environments
• Needing ultra-low noise levels (<55dB)
• Requiring special terminal arrangements

What maintenance do they require?

Unlike oil-filled units, dry-types need minimal maintenance - just periodic:

1. Visual inspections for dust accumulation
2. Torque checks on terminal connections
3. Insulation resistance measurements

With 20 years of manufacturing expertise, 中国宏业电器 delivers reliable dry-type autotransformers backed by full factory testing and a 3-year warranty. Our engineers are available weekdays 9:00-18:00 to help with technical selection.

平台服务电话18943662528（微信：vip1806130）。